/*
 * Copyright (c) 2010, VeRSI Consortium
 *   (Victorian eResearch Strategic Initiative, Australia)
 * All rights reserved.
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the VeRSI, the VeRSI Consortium members, nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package versi.vitro.oaiserviceprovider.service.transformer.impl;

import javax.xml.transform.Result;
import javax.xml.transform.Source;

import org.apache.log4j.Logger;

import versi.vitro.oaiserviceprovider.service.transformer.api.StreamFactory;
import versi.vitro.oaiserviceprovider.service.transformer.api.TransformerService;
import versi.vitro.oaiserviceprovider.xml.XmlTransformer;
import versi.vitro.oaiserviceprovider.xml.XmlTransformerFactory;

/**
 * Service implementing {@link TransformerService}.
 */
public class TransformerServiceImpl implements TransformerService {
 
    /** log4j instance. */
    static final Logger LOGGER = Logger.getLogger(TransformerServiceImpl.class);
    
    private XmlTransformerFactory transformerFactory;

    /**
     * Default Constructor.
     */
    public TransformerServiceImpl(XmlTransformerFactory transformerFactory) {
	super();
	this.transformerFactory = transformerFactory;
    }

    /** {@inheritDoc} */
    public byte[] applyXSLT(byte[] source, byte[] xslt) {

	StreamFactory conectionFactory = createConnectionFactory(source, xslt);
	try {
	    Source xmlInput = conectionFactory.createXmlInputSource();
	    Source xsltInput = conectionFactory.createXsltInputSource();
	    Result xmlOutput = conectionFactory.createXmlOutputResult();

	    XmlTransformer transformer = transformerFactory.create(xsltInput);
	    transformer.transform(xmlInput, xmlOutput);
	} finally {
	    conectionFactory.close();
	}
	return conectionFactory.xmlResult();
    }
    
    protected StreamFactory createConnectionFactory(byte[] source, byte[] xslt) {
	return new StreamFactoryImpl(source, xslt);
    }

}
